This signal loss is compensated for in the Pultec using a valve amplification stage. The Pultec is a passive design, which many feel sounds better due to the simplicity of the circuit, but passive designs are inherently ‘lossy’ meaning that less signal comes out than went in. Its unusual design offers a variable width bell filter treble boost which operates at 7 switchable frequencies, a switchable low pass filter, referred to as “atten” which operates at 5, 10, and 20KHz, and the famous low-frequency cut and boost controls which, while sharing a 4 position frequency switch, have independent cut and boost controls. Designed by Ollie Summerland and Gene Shenk in 1951, the Pultec EQP-1A is the unit most people think of when they refer to a “Pultec”.
Everybody who has spent any amount of time mixing will be aware of the Pultec EQ.
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